1#include "cache.h"
2#include "remote.h"
3#include "refs.h"
4#include "commit.h"
5#include "diff.h"
6#include "revision.h"
7#include "dir.h"
8#include "tag.h"
9#include "string-list.h"
10#include "mergesort.h"
11#include "argv-array.h"
12
13enum map_direction { FROM_SRC, FROM_DST };
14
15static struct refspec s_tag_refspec = {
16 0,
17 1,
18 0,
19 0,
20 "refs/tags/*",
21 "refs/tags/*"
22};
23
24const struct refspec *tag_refspec = &s_tag_refspec;
25
26struct counted_string {
27 size_t len;
28 const char *s;
29};
30struct rewrite {
31 const char *base;
32 size_t baselen;
33 struct counted_string *instead_of;
34 int instead_of_nr;
35 int instead_of_alloc;
36};
37struct rewrites {
38 struct rewrite **rewrite;
39 int rewrite_alloc;
40 int rewrite_nr;
41};
42
43static struct remote **remotes;
44static int remotes_alloc;
45static int remotes_nr;
46static struct hashmap remotes_hash;
47
48static struct branch **branches;
49static int branches_alloc;
50static int branches_nr;
51
52static struct branch *current_branch;
53static const char *pushremote_name;
54
55static struct rewrites rewrites;
56static struct rewrites rewrites_push;
57
58static int valid_remote(const struct remote *remote)
59{
60 return (!!remote->url) || (!!remote->foreign_vcs);
61}
62
63static const char *alias_url(const char *url, struct rewrites *r)
64{
65 int i, j;
66 struct counted_string *longest;
67 int longest_i;
68
69 longest = NULL;
70 longest_i = -1;
71 for (i = 0; i < r->rewrite_nr; i++) {
72 if (!r->rewrite[i])
73 continue;
74 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
75 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
76 (!longest ||
77 longest->len < r->rewrite[i]->instead_of[j].len)) {
78 longest = &(r->rewrite[i]->instead_of[j]);
79 longest_i = i;
80 }
81 }
82 }
83 if (!longest)
84 return url;
85
86 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
87}
88
89static void add_push_refspec(struct remote *remote, const char *ref)
90{
91 ALLOC_GROW(remote->push_refspec,
92 remote->push_refspec_nr + 1,
93 remote->push_refspec_alloc);
94 remote->push_refspec[remote->push_refspec_nr++] = ref;
95}
96
97static void add_fetch_refspec(struct remote *remote, const char *ref)
98{
99 ALLOC_GROW(remote->fetch_refspec,
100 remote->fetch_refspec_nr + 1,
101 remote->fetch_refspec_alloc);
102 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
103}
104
105static void add_url(struct remote *remote, const char *url)
106{
107 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
108 remote->url[remote->url_nr++] = url;
109}
110
111static void add_pushurl(struct remote *remote, const char *pushurl)
112{
113 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
114 remote->pushurl[remote->pushurl_nr++] = pushurl;
115}
116
117static void add_pushurl_alias(struct remote *remote, const char *url)
118{
119 const char *pushurl = alias_url(url, &rewrites_push);
120 if (pushurl != url)
121 add_pushurl(remote, pushurl);
122}
123
124static void add_url_alias(struct remote *remote, const char *url)
125{
126 add_url(remote, alias_url(url, &rewrites));
127 add_pushurl_alias(remote, url);
128}
129
130struct remotes_hash_key {
131 const char *str;
132 int len;
133};
134
135static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
136{
137 if (key)
138 return strncmp(a->name, key->str, key->len) || a->name[key->len];
139 else
140 return strcmp(a->name, b->name);
141}
142
143static inline void init_remotes_hash(void)
144{
145 if (!remotes_hash.cmpfn)
146 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
147}
148
149static struct remote *make_remote(const char *name, int len)
150{
151 struct remote *ret, *replaced;
152 struct remotes_hash_key lookup;
153 struct hashmap_entry lookup_entry;
154
155 if (!len)
156 len = strlen(name);
157
158 init_remotes_hash();
159 lookup.str = name;
160 lookup.len = len;
161 hashmap_entry_init(&lookup_entry, memhash(name, len));
162
163 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
164 return ret;
165
166 ret = xcalloc(1, sizeof(struct remote));
167 ret->prune = -1; /* unspecified */
168 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
169 remotes[remotes_nr++] = ret;
170 ret->name = xstrndup(name, len);
171
172 hashmap_entry_init(ret, lookup_entry.hash);
173 replaced = hashmap_put(&remotes_hash, ret);
174 assert(replaced == NULL); /* no previous entry overwritten */
175 return ret;
176}
177
178static void add_merge(struct branch *branch, const char *name)
179{
180 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
181 branch->merge_alloc);
182 branch->merge_name[branch->merge_nr++] = name;
183}
184
185static struct branch *make_branch(const char *name, int len)
186{
187 struct branch *ret;
188 int i;
189
190 for (i = 0; i < branches_nr; i++) {
191 if (len ? (!strncmp(name, branches[i]->name, len) &&
192 !branches[i]->name[len]) :
193 !strcmp(name, branches[i]->name))
194 return branches[i];
195 }
196
197 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
198 ret = xcalloc(1, sizeof(struct branch));
199 branches[branches_nr++] = ret;
200 if (len)
201 ret->name = xstrndup(name, len);
202 else
203 ret->name = xstrdup(name);
204 ret->refname = xstrfmt("refs/heads/%s", ret->name);
205
206 return ret;
207}
208
209static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
210{
211 struct rewrite *ret;
212 int i;
213
214 for (i = 0; i < r->rewrite_nr; i++) {
215 if (len
216 ? (len == r->rewrite[i]->baselen &&
217 !strncmp(base, r->rewrite[i]->base, len))
218 : !strcmp(base, r->rewrite[i]->base))
219 return r->rewrite[i];
220 }
221
222 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
223 ret = xcalloc(1, sizeof(struct rewrite));
224 r->rewrite[r->rewrite_nr++] = ret;
225 if (len) {
226 ret->base = xstrndup(base, len);
227 ret->baselen = len;
228 }
229 else {
230 ret->base = xstrdup(base);
231 ret->baselen = strlen(base);
232 }
233 return ret;
234}
235
236static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
237{
238 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
239 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
240 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
241 rewrite->instead_of_nr++;
242}
243
244static const char *skip_spaces(const char *s)
245{
246 while (isspace(*s))
247 s++;
248 return s;
249}
250
251static void read_remotes_file(struct remote *remote)
252{
253 struct strbuf buf = STRBUF_INIT;
254 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
255
256 if (!f)
257 return;
258 remote->configured_in_repo = 1;
259 remote->origin = REMOTE_REMOTES;
260 while (strbuf_getline(&buf, f) != EOF) {
261 const char *v;
262
263 strbuf_rtrim(&buf);
264
265 if (skip_prefix(buf.buf, "URL:", &v))
266 add_url_alias(remote, xstrdup(skip_spaces(v)));
267 else if (skip_prefix(buf.buf, "Push:", &v))
268 add_push_refspec(remote, xstrdup(skip_spaces(v)));
269 else if (skip_prefix(buf.buf, "Pull:", &v))
270 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
271 }
272 strbuf_release(&buf);
273 fclose(f);
274}
275
276static void read_branches_file(struct remote *remote)
277{
278 char *frag;
279 struct strbuf buf = STRBUF_INIT;
280 FILE *f = fopen(git_path("branches/%s", remote->name), "r");
281
282 if (!f)
283 return;
284
285 strbuf_getline_lf(&buf, f);
286 fclose(f);
287 strbuf_trim(&buf);
288 if (!buf.len) {
289 strbuf_release(&buf);
290 return;
291 }
292
293 remote->configured_in_repo = 1;
294 remote->origin = REMOTE_BRANCHES;
295
296 /*
297 * The branches file would have URL and optionally
298 * #branch specified. The "master" (or specified) branch is
299 * fetched and stored in the local branch matching the
300 * remote name.
301 */
302 frag = strchr(buf.buf, '#');
303 if (frag)
304 *(frag++) = '\0';
305 else
306 frag = "master";
307
308 add_url_alias(remote, strbuf_detach(&buf, NULL));
309 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
310 frag, remote->name));
311
312 /*
313 * Cogito compatible push: push current HEAD to remote #branch
314 * (master if missing)
315 */
316 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
317 remote->fetch_tags = 1; /* always auto-follow */
318}
319
320static int handle_config(const char *key, const char *value, void *cb)
321{
322 const char *name;
323 int namelen;
324 const char *subkey;
325 struct remote *remote;
326 struct branch *branch;
327 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
328 if (!name)
329 return 0;
330 branch = make_branch(name, namelen);
331 if (!strcmp(subkey, "remote")) {
332 return git_config_string(&branch->remote_name, key, value);
333 } else if (!strcmp(subkey, "pushremote")) {
334 return git_config_string(&branch->pushremote_name, key, value);
335 } else if (!strcmp(subkey, "merge")) {
336 if (!value)
337 return config_error_nonbool(key);
338 add_merge(branch, xstrdup(value));
339 }
340 return 0;
341 }
342 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
343 struct rewrite *rewrite;
344 if (!name)
345 return 0;
346 if (!strcmp(subkey, "insteadof")) {
347 rewrite = make_rewrite(&rewrites, name, namelen);
348 if (!value)
349 return config_error_nonbool(key);
350 add_instead_of(rewrite, xstrdup(value));
351 } else if (!strcmp(subkey, "pushinsteadof")) {
352 rewrite = make_rewrite(&rewrites_push, name, namelen);
353 if (!value)
354 return config_error_nonbool(key);
355 add_instead_of(rewrite, xstrdup(value));
356 }
357 }
358
359 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
360 return 0;
361
362 /* Handle remote.* variables */
363 if (!name && !strcmp(subkey, "pushdefault"))
364 return git_config_string(&pushremote_name, key, value);
365
366 if (!name)
367 return 0;
368 /* Handle remote.<name>.* variables */
369 if (*name == '/') {
370 warning("Config remote shorthand cannot begin with '/': %s",
371 name);
372 return 0;
373 }
374 remote = make_remote(name, namelen);
375 remote->origin = REMOTE_CONFIG;
376 if (current_config_scope() == CONFIG_SCOPE_REPO)
377 remote->configured_in_repo = 1;
378 if (!strcmp(subkey, "mirror"))
379 remote->mirror = git_config_bool(key, value);
380 else if (!strcmp(subkey, "skipdefaultupdate"))
381 remote->skip_default_update = git_config_bool(key, value);
382 else if (!strcmp(subkey, "skipfetchall"))
383 remote->skip_default_update = git_config_bool(key, value);
384 else if (!strcmp(subkey, "prune"))
385 remote->prune = git_config_bool(key, value);
386 else if (!strcmp(subkey, "url")) {
387 const char *v;
388 if (git_config_string(&v, key, value))
389 return -1;
390 add_url(remote, v);
391 } else if (!strcmp(subkey, "pushurl")) {
392 const char *v;
393 if (git_config_string(&v, key, value))
394 return -1;
395 add_pushurl(remote, v);
396 } else if (!strcmp(subkey, "push")) {
397 const char *v;
398 if (git_config_string(&v, key, value))
399 return -1;
400 add_push_refspec(remote, v);
401 } else if (!strcmp(subkey, "fetch")) {
402 const char *v;
403 if (git_config_string(&v, key, value))
404 return -1;
405 add_fetch_refspec(remote, v);
406 } else if (!strcmp(subkey, "receivepack")) {
407 const char *v;
408 if (git_config_string(&v, key, value))
409 return -1;
410 if (!remote->receivepack)
411 remote->receivepack = v;
412 else
413 error("more than one receivepack given, using the first");
414 } else if (!strcmp(subkey, "uploadpack")) {
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 if (!remote->uploadpack)
419 remote->uploadpack = v;
420 else
421 error("more than one uploadpack given, using the first");
422 } else if (!strcmp(subkey, "tagopt")) {
423 if (!strcmp(value, "--no-tags"))
424 remote->fetch_tags = -1;
425 else if (!strcmp(value, "--tags"))
426 remote->fetch_tags = 2;
427 } else if (!strcmp(subkey, "proxy")) {
428 return git_config_string((const char **)&remote->http_proxy,
429 key, value);
430 } else if (!strcmp(subkey, "proxyauthmethod")) {
431 return git_config_string((const char **)&remote->http_proxy_authmethod,
432 key, value);
433 } else if (!strcmp(subkey, "vcs")) {
434 return git_config_string(&remote->foreign_vcs, key, value);
435 }
436 return 0;
437}
438
439static void alias_all_urls(void)
440{
441 int i, j;
442 for (i = 0; i < remotes_nr; i++) {
443 int add_pushurl_aliases;
444 if (!remotes[i])
445 continue;
446 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
447 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
448 }
449 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
450 for (j = 0; j < remotes[i]->url_nr; j++) {
451 if (add_pushurl_aliases)
452 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
453 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
454 }
455 }
456}
457
458static void read_config(void)
459{
460 static int loaded;
461 struct object_id oid;
462 int flag;
463
464 if (loaded)
465 return;
466 loaded = 1;
467
468 current_branch = NULL;
469 if (startup_info->have_repository) {
470 const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
471 if (head_ref && (flag & REF_ISSYMREF) &&
472 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
473 current_branch = make_branch(head_ref, 0);
474 }
475 }
476 git_config(handle_config, NULL);
477 alias_all_urls();
478}
479
480static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
481{
482 int i;
483 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
484
485 for (i = 0; i < nr_refspec; i++) {
486 size_t llen;
487 int is_glob;
488 const char *lhs, *rhs;
489 int flags;
490
491 is_glob = 0;
492
493 lhs = refspec[i];
494 if (*lhs == '+') {
495 rs[i].force = 1;
496 lhs++;
497 }
498
499 rhs = strrchr(lhs, ':');
500
501 /*
502 * Before going on, special case ":" (or "+:") as a refspec
503 * for pushing matching refs.
504 */
505 if (!fetch && rhs == lhs && rhs[1] == '\0') {
506 rs[i].matching = 1;
507 continue;
508 }
509
510 if (rhs) {
511 size_t rlen = strlen(++rhs);
512 is_glob = (1 <= rlen && strchr(rhs, '*'));
513 rs[i].dst = xstrndup(rhs, rlen);
514 }
515
516 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
517 if (1 <= llen && memchr(lhs, '*', llen)) {
518 if ((rhs && !is_glob) || (!rhs && fetch))
519 goto invalid;
520 is_glob = 1;
521 } else if (rhs && is_glob) {
522 goto invalid;
523 }
524
525 rs[i].pattern = is_glob;
526 rs[i].src = xstrndup(lhs, llen);
527 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
528
529 if (fetch) {
530 struct object_id unused;
531
532 /* LHS */
533 if (!*rs[i].src)
534 ; /* empty is ok; it means "HEAD" */
535 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
536 rs[i].exact_sha1 = 1; /* ok */
537 else if (!check_refname_format(rs[i].src, flags))
538 ; /* valid looking ref is ok */
539 else
540 goto invalid;
541 /* RHS */
542 if (!rs[i].dst)
543 ; /* missing is ok; it is the same as empty */
544 else if (!*rs[i].dst)
545 ; /* empty is ok; it means "do not store" */
546 else if (!check_refname_format(rs[i].dst, flags))
547 ; /* valid looking ref is ok */
548 else
549 goto invalid;
550 } else {
551 /*
552 * LHS
553 * - empty is allowed; it means delete.
554 * - when wildcarded, it must be a valid looking ref.
555 * - otherwise, it must be an extended SHA-1, but
556 * there is no existing way to validate this.
557 */
558 if (!*rs[i].src)
559 ; /* empty is ok */
560 else if (is_glob) {
561 if (check_refname_format(rs[i].src, flags))
562 goto invalid;
563 }
564 else
565 ; /* anything goes, for now */
566 /*
567 * RHS
568 * - missing is allowed, but LHS then must be a
569 * valid looking ref.
570 * - empty is not allowed.
571 * - otherwise it must be a valid looking ref.
572 */
573 if (!rs[i].dst) {
574 if (check_refname_format(rs[i].src, flags))
575 goto invalid;
576 } else if (!*rs[i].dst) {
577 goto invalid;
578 } else {
579 if (check_refname_format(rs[i].dst, flags))
580 goto invalid;
581 }
582 }
583 }
584 return rs;
585
586 invalid:
587 if (verify) {
588 /*
589 * nr_refspec must be greater than zero and i must be valid
590 * since it is only possible to reach this point from within
591 * the for loop above.
592 */
593 free_refspec(i+1, rs);
594 return NULL;
595 }
596 die("Invalid refspec '%s'", refspec[i]);
597}
598
599int valid_fetch_refspec(const char *fetch_refspec_str)
600{
601 struct refspec *refspec;
602
603 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
604 free_refspec(1, refspec);
605 return !!refspec;
606}
607
608struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
609{
610 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
611}
612
613struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
614{
615 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
616}
617
618void free_refspec(int nr_refspec, struct refspec *refspec)
619{
620 int i;
621
622 if (!refspec)
623 return;
624
625 for (i = 0; i < nr_refspec; i++) {
626 free(refspec[i].src);
627 free(refspec[i].dst);
628 }
629 free(refspec);
630}
631
632static int valid_remote_nick(const char *name)
633{
634 if (!name[0] || is_dot_or_dotdot(name))
635 return 0;
636 return !strchr(name, '/'); /* no slash */
637}
638
639const char *remote_for_branch(struct branch *branch, int *explicit)
640{
641 if (branch && branch->remote_name) {
642 if (explicit)
643 *explicit = 1;
644 return branch->remote_name;
645 }
646 if (explicit)
647 *explicit = 0;
648 return "origin";
649}
650
651const char *pushremote_for_branch(struct branch *branch, int *explicit)
652{
653 if (branch && branch->pushremote_name) {
654 if (explicit)
655 *explicit = 1;
656 return branch->pushremote_name;
657 }
658 if (pushremote_name) {
659 if (explicit)
660 *explicit = 1;
661 return pushremote_name;
662 }
663 return remote_for_branch(branch, explicit);
664}
665
666static struct remote *remote_get_1(const char *name,
667 const char *(*get_default)(struct branch *, int *))
668{
669 struct remote *ret;
670 int name_given = 0;
671
672 read_config();
673
674 if (name)
675 name_given = 1;
676 else
677 name = get_default(current_branch, &name_given);
678
679 ret = make_remote(name, 0);
680 if (valid_remote_nick(name) && have_git_dir()) {
681 if (!valid_remote(ret))
682 read_remotes_file(ret);
683 if (!valid_remote(ret))
684 read_branches_file(ret);
685 }
686 if (name_given && !valid_remote(ret))
687 add_url_alias(ret, name);
688 if (!valid_remote(ret))
689 return NULL;
690 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
691 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
692 return ret;
693}
694
695struct remote *remote_get(const char *name)
696{
697 return remote_get_1(name, remote_for_branch);
698}
699
700struct remote *pushremote_get(const char *name)
701{
702 return remote_get_1(name, pushremote_for_branch);
703}
704
705int remote_is_configured(struct remote *remote, int in_repo)
706{
707 if (!remote)
708 return 0;
709 if (in_repo)
710 return remote->configured_in_repo;
711 return !!remote->origin;
712}
713
714int for_each_remote(each_remote_fn fn, void *priv)
715{
716 int i, result = 0;
717 read_config();
718 for (i = 0; i < remotes_nr && !result; i++) {
719 struct remote *r = remotes[i];
720 if (!r)
721 continue;
722 if (!r->fetch)
723 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
724 r->fetch_refspec);
725 if (!r->push)
726 r->push = parse_push_refspec(r->push_refspec_nr,
727 r->push_refspec);
728 result = fn(r, priv);
729 }
730 return result;
731}
732
733static void handle_duplicate(struct ref *ref1, struct ref *ref2)
734{
735 if (strcmp(ref1->name, ref2->name)) {
736 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
737 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
738 die(_("Cannot fetch both %s and %s to %s"),
739 ref1->name, ref2->name, ref2->peer_ref->name);
740 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
741 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
742 warning(_("%s usually tracks %s, not %s"),
743 ref2->peer_ref->name, ref2->name, ref1->name);
744 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
745 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
746 die(_("%s tracks both %s and %s"),
747 ref2->peer_ref->name, ref1->name, ref2->name);
748 } else {
749 /*
750 * This last possibility doesn't occur because
751 * FETCH_HEAD_IGNORE entries always appear at
752 * the end of the list.
753 */
754 die(_("Internal error"));
755 }
756 }
757 free(ref2->peer_ref);
758 free(ref2);
759}
760
761struct ref *ref_remove_duplicates(struct ref *ref_map)
762{
763 struct string_list refs = STRING_LIST_INIT_NODUP;
764 struct ref *retval = NULL;
765 struct ref **p = &retval;
766
767 while (ref_map) {
768 struct ref *ref = ref_map;
769
770 ref_map = ref_map->next;
771 ref->next = NULL;
772
773 if (!ref->peer_ref) {
774 *p = ref;
775 p = &ref->next;
776 } else {
777 struct string_list_item *item =
778 string_list_insert(&refs, ref->peer_ref->name);
779
780 if (item->util) {
781 /* Entry already existed */
782 handle_duplicate((struct ref *)item->util, ref);
783 } else {
784 *p = ref;
785 p = &ref->next;
786 item->util = ref;
787 }
788 }
789 }
790
791 string_list_clear(&refs, 0);
792 return retval;
793}
794
795int remote_has_url(struct remote *remote, const char *url)
796{
797 int i;
798 for (i = 0; i < remote->url_nr; i++) {
799 if (!strcmp(remote->url[i], url))
800 return 1;
801 }
802 return 0;
803}
804
805static int match_name_with_pattern(const char *key, const char *name,
806 const char *value, char **result)
807{
808 const char *kstar = strchr(key, '*');
809 size_t klen;
810 size_t ksuffixlen;
811 size_t namelen;
812 int ret;
813 if (!kstar)
814 die("Key '%s' of pattern had no '*'", key);
815 klen = kstar - key;
816 ksuffixlen = strlen(kstar + 1);
817 namelen = strlen(name);
818 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
819 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
820 if (ret && value) {
821 struct strbuf sb = STRBUF_INIT;
822 const char *vstar = strchr(value, '*');
823 if (!vstar)
824 die("Value '%s' of pattern has no '*'", value);
825 strbuf_add(&sb, value, vstar - value);
826 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
827 strbuf_addstr(&sb, vstar + 1);
828 *result = strbuf_detach(&sb, NULL);
829 }
830 return ret;
831}
832
833static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
834{
835 int i;
836 int find_src = !query->src;
837
838 if (find_src && !query->dst)
839 error("query_refspecs_multiple: need either src or dst");
840
841 for (i = 0; i < ref_count; i++) {
842 struct refspec *refspec = &refs[i];
843 const char *key = find_src ? refspec->dst : refspec->src;
844 const char *value = find_src ? refspec->src : refspec->dst;
845 const char *needle = find_src ? query->dst : query->src;
846 char **result = find_src ? &query->src : &query->dst;
847
848 if (!refspec->dst)
849 continue;
850 if (refspec->pattern) {
851 if (match_name_with_pattern(key, needle, value, result))
852 string_list_append_nodup(results, *result);
853 } else if (!strcmp(needle, key)) {
854 string_list_append(results, value);
855 }
856 }
857}
858
859int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
860{
861 int i;
862 int find_src = !query->src;
863 const char *needle = find_src ? query->dst : query->src;
864 char **result = find_src ? &query->src : &query->dst;
865
866 if (find_src && !query->dst)
867 return error("query_refspecs: need either src or dst");
868
869 for (i = 0; i < ref_count; i++) {
870 struct refspec *refspec = &refs[i];
871 const char *key = find_src ? refspec->dst : refspec->src;
872 const char *value = find_src ? refspec->src : refspec->dst;
873
874 if (!refspec->dst)
875 continue;
876 if (refspec->pattern) {
877 if (match_name_with_pattern(key, needle, value, result)) {
878 query->force = refspec->force;
879 return 0;
880 }
881 } else if (!strcmp(needle, key)) {
882 *result = xstrdup(value);
883 query->force = refspec->force;
884 return 0;
885 }
886 }
887 return -1;
888}
889
890char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
891 const char *name)
892{
893 struct refspec query;
894
895 memset(&query, 0, sizeof(struct refspec));
896 query.src = (char *)name;
897
898 if (query_refspecs(refspecs, nr_refspec, &query))
899 return NULL;
900
901 return query.dst;
902}
903
904int remote_find_tracking(struct remote *remote, struct refspec *refspec)
905{
906 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
907}
908
909static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
910 const char *name)
911{
912 size_t len = strlen(name);
913 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
914 memcpy(ref->name, prefix, prefixlen);
915 memcpy(ref->name + prefixlen, name, len);
916 return ref;
917}
918
919struct ref *alloc_ref(const char *name)
920{
921 return alloc_ref_with_prefix("", 0, name);
922}
923
924struct ref *copy_ref(const struct ref *ref)
925{
926 struct ref *cpy;
927 size_t len;
928 if (!ref)
929 return NULL;
930 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
931 cpy = xmalloc(len);
932 memcpy(cpy, ref, len);
933 cpy->next = NULL;
934 cpy->symref = xstrdup_or_null(ref->symref);
935 cpy->remote_status = xstrdup_or_null(ref->remote_status);
936 cpy->peer_ref = copy_ref(ref->peer_ref);
937 return cpy;
938}
939
940struct ref *copy_ref_list(const struct ref *ref)
941{
942 struct ref *ret = NULL;
943 struct ref **tail = &ret;
944 while (ref) {
945 *tail = copy_ref(ref);
946 ref = ref->next;
947 tail = &((*tail)->next);
948 }
949 return ret;
950}
951
952static void free_ref(struct ref *ref)
953{
954 if (!ref)
955 return;
956 free_ref(ref->peer_ref);
957 free(ref->remote_status);
958 free(ref->symref);
959 free(ref);
960}
961
962void free_refs(struct ref *ref)
963{
964 struct ref *next;
965 while (ref) {
966 next = ref->next;
967 free_ref(ref);
968 ref = next;
969 }
970}
971
972int ref_compare_name(const void *va, const void *vb)
973{
974 const struct ref *a = va, *b = vb;
975 return strcmp(a->name, b->name);
976}
977
978static void *ref_list_get_next(const void *a)
979{
980 return ((const struct ref *)a)->next;
981}
982
983static void ref_list_set_next(void *a, void *next)
984{
985 ((struct ref *)a)->next = next;
986}
987
988void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
989{
990 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
991}
992
993int count_refspec_match(const char *pattern,
994 struct ref *refs,
995 struct ref **matched_ref)
996{
997 int patlen = strlen(pattern);
998 struct ref *matched_weak = NULL;
999 struct ref *matched = NULL;
1000 int weak_match = 0;
1001 int match = 0;
1002
1003 for (weak_match = match = 0; refs; refs = refs->next) {
1004 char *name = refs->name;
1005 int namelen = strlen(name);
1006
1007 if (!refname_match(pattern, name))
1008 continue;
1009
1010 /* A match is "weak" if it is with refs outside
1011 * heads or tags, and did not specify the pattern
1012 * in full (e.g. "refs/remotes/origin/master") or at
1013 * least from the toplevel (e.g. "remotes/origin/master");
1014 * otherwise "git push $URL master" would result in
1015 * ambiguity between remotes/origin/master and heads/master
1016 * at the remote site.
1017 */
1018 if (namelen != patlen &&
1019 patlen != namelen - 5 &&
1020 !starts_with(name, "refs/heads/") &&
1021 !starts_with(name, "refs/tags/")) {
1022 /* We want to catch the case where only weak
1023 * matches are found and there are multiple
1024 * matches, and where more than one strong
1025 * matches are found, as ambiguous. One
1026 * strong match with zero or more weak matches
1027 * are acceptable as a unique match.
1028 */
1029 matched_weak = refs;
1030 weak_match++;
1031 }
1032 else {
1033 matched = refs;
1034 match++;
1035 }
1036 }
1037 if (!matched) {
1038 if (matched_ref)
1039 *matched_ref = matched_weak;
1040 return weak_match;
1041 }
1042 else {
1043 if (matched_ref)
1044 *matched_ref = matched;
1045 return match;
1046 }
1047}
1048
1049static void tail_link_ref(struct ref *ref, struct ref ***tail)
1050{
1051 **tail = ref;
1052 while (ref->next)
1053 ref = ref->next;
1054 *tail = &ref->next;
1055}
1056
1057static struct ref *alloc_delete_ref(void)
1058{
1059 struct ref *ref = alloc_ref("(delete)");
1060 oidclr(&ref->new_oid);
1061 return ref;
1062}
1063
1064static int try_explicit_object_name(const char *name,
1065 struct ref **match)
1066{
1067 struct object_id oid;
1068
1069 if (!*name) {
1070 if (match)
1071 *match = alloc_delete_ref();
1072 return 0;
1073 }
1074
1075 if (get_sha1(name, oid.hash))
1076 return -1;
1077
1078 if (match) {
1079 *match = alloc_ref(name);
1080 oidcpy(&(*match)->new_oid, &oid);
1081 }
1082 return 0;
1083}
1084
1085static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1086{
1087 struct ref *ret = alloc_ref(name);
1088 tail_link_ref(ret, tail);
1089 return ret;
1090}
1091
1092static char *guess_ref(const char *name, struct ref *peer)
1093{
1094 struct strbuf buf = STRBUF_INIT;
1095 struct object_id oid;
1096
1097 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1098 oid.hash, NULL);
1099 if (!r)
1100 return NULL;
1101
1102 if (starts_with(r, "refs/heads/"))
1103 strbuf_addstr(&buf, "refs/heads/");
1104 else if (starts_with(r, "refs/tags/"))
1105 strbuf_addstr(&buf, "refs/tags/");
1106 else
1107 return NULL;
1108
1109 strbuf_addstr(&buf, name);
1110 return strbuf_detach(&buf, NULL);
1111}
1112
1113static int match_explicit_lhs(struct ref *src,
1114 struct refspec *rs,
1115 struct ref **match,
1116 int *allocated_match)
1117{
1118 switch (count_refspec_match(rs->src, src, match)) {
1119 case 1:
1120 if (allocated_match)
1121 *allocated_match = 0;
1122 return 0;
1123 case 0:
1124 /* The source could be in the get_sha1() format
1125 * not a reference name. :refs/other is a
1126 * way to delete 'other' ref at the remote end.
1127 */
1128 if (try_explicit_object_name(rs->src, match) < 0)
1129 return error("src refspec %s does not match any.", rs->src);
1130 if (allocated_match)
1131 *allocated_match = 1;
1132 return 0;
1133 default:
1134 return error("src refspec %s matches more than one.", rs->src);
1135 }
1136}
1137
1138static int match_explicit(struct ref *src, struct ref *dst,
1139 struct ref ***dst_tail,
1140 struct refspec *rs)
1141{
1142 struct ref *matched_src, *matched_dst;
1143 int allocated_src;
1144
1145 const char *dst_value = rs->dst;
1146 char *dst_guess;
1147
1148 if (rs->pattern || rs->matching)
1149 return 0;
1150
1151 matched_src = matched_dst = NULL;
1152 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1153 return -1;
1154
1155 if (!dst_value) {
1156 struct object_id oid;
1157 int flag;
1158
1159 dst_value = resolve_ref_unsafe(matched_src->name,
1160 RESOLVE_REF_READING,
1161 oid.hash, &flag);
1162 if (!dst_value ||
1163 ((flag & REF_ISSYMREF) &&
1164 !starts_with(dst_value, "refs/heads/")))
1165 die("%s cannot be resolved to branch.",
1166 matched_src->name);
1167 }
1168
1169 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1170 case 1:
1171 break;
1172 case 0:
1173 if (starts_with(dst_value, "refs/"))
1174 matched_dst = make_linked_ref(dst_value, dst_tail);
1175 else if (is_null_oid(&matched_src->new_oid))
1176 error("unable to delete '%s': remote ref does not exist",
1177 dst_value);
1178 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1179 matched_dst = make_linked_ref(dst_guess, dst_tail);
1180 else
1181 error("unable to push to unqualified destination: %s\n"
1182 "The destination refspec neither matches an "
1183 "existing ref on the remote nor\n"
1184 "begins with refs/, and we are unable to "
1185 "guess a prefix based on the source ref.",
1186 dst_value);
1187 break;
1188 default:
1189 matched_dst = NULL;
1190 error("dst refspec %s matches more than one.",
1191 dst_value);
1192 break;
1193 }
1194 if (!matched_dst)
1195 return -1;
1196 if (matched_dst->peer_ref)
1197 return error("dst ref %s receives from more than one src.",
1198 matched_dst->name);
1199 else {
1200 matched_dst->peer_ref = allocated_src ?
1201 matched_src :
1202 copy_ref(matched_src);
1203 matched_dst->force = rs->force;
1204 }
1205 return 0;
1206}
1207
1208static int match_explicit_refs(struct ref *src, struct ref *dst,
1209 struct ref ***dst_tail, struct refspec *rs,
1210 int rs_nr)
1211{
1212 int i, errs;
1213 for (i = errs = 0; i < rs_nr; i++)
1214 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1215 return errs;
1216}
1217
1218static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1219 int send_mirror, int direction, const struct refspec **ret_pat)
1220{
1221 const struct refspec *pat;
1222 char *name;
1223 int i;
1224 int matching_refs = -1;
1225 for (i = 0; i < rs_nr; i++) {
1226 if (rs[i].matching &&
1227 (matching_refs == -1 || rs[i].force)) {
1228 matching_refs = i;
1229 continue;
1230 }
1231
1232 if (rs[i].pattern) {
1233 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1234 int match;
1235 if (direction == FROM_SRC)
1236 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1237 else
1238 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1239 if (match) {
1240 matching_refs = i;
1241 break;
1242 }
1243 }
1244 }
1245 if (matching_refs == -1)
1246 return NULL;
1247
1248 pat = rs + matching_refs;
1249 if (pat->matching) {
1250 /*
1251 * "matching refs"; traditionally we pushed everything
1252 * including refs outside refs/heads/ hierarchy, but
1253 * that does not make much sense these days.
1254 */
1255 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1256 return NULL;
1257 name = xstrdup(ref->name);
1258 }
1259 if (ret_pat)
1260 *ret_pat = pat;
1261 return name;
1262}
1263
1264static struct ref **tail_ref(struct ref **head)
1265{
1266 struct ref **tail = head;
1267 while (*tail)
1268 tail = &((*tail)->next);
1269 return tail;
1270}
1271
1272struct tips {
1273 struct commit **tip;
1274 int nr, alloc;
1275};
1276
1277static void add_to_tips(struct tips *tips, const struct object_id *oid)
1278{
1279 struct commit *commit;
1280
1281 if (is_null_oid(oid))
1282 return;
1283 commit = lookup_commit_reference_gently(oid->hash, 1);
1284 if (!commit || (commit->object.flags & TMP_MARK))
1285 return;
1286 commit->object.flags |= TMP_MARK;
1287 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1288 tips->tip[tips->nr++] = commit;
1289}
1290
1291static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1292{
1293 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1294 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1295 struct string_list_item *item;
1296 struct ref *ref;
1297 struct tips sent_tips;
1298
1299 /*
1300 * Collect everything we know they would have at the end of
1301 * this push, and collect all tags they have.
1302 */
1303 memset(&sent_tips, 0, sizeof(sent_tips));
1304 for (ref = *dst; ref; ref = ref->next) {
1305 if (ref->peer_ref &&
1306 !is_null_oid(&ref->peer_ref->new_oid))
1307 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1308 else
1309 add_to_tips(&sent_tips, &ref->old_oid);
1310 if (starts_with(ref->name, "refs/tags/"))
1311 string_list_append(&dst_tag, ref->name);
1312 }
1313 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1314
1315 string_list_sort(&dst_tag);
1316
1317 /* Collect tags they do not have. */
1318 for (ref = src; ref; ref = ref->next) {
1319 if (!starts_with(ref->name, "refs/tags/"))
1320 continue; /* not a tag */
1321 if (string_list_has_string(&dst_tag, ref->name))
1322 continue; /* they already have it */
1323 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1324 continue; /* be conservative */
1325 item = string_list_append(&src_tag, ref->name);
1326 item->util = ref;
1327 }
1328 string_list_clear(&dst_tag, 0);
1329
1330 /*
1331 * At this point, src_tag lists tags that are missing from
1332 * dst, and sent_tips lists the tips we are pushing or those
1333 * that we know they already have. An element in the src_tag
1334 * that is an ancestor of any of the sent_tips needs to be
1335 * sent to the other side.
1336 */
1337 if (sent_tips.nr) {
1338 for_each_string_list_item(item, &src_tag) {
1339 struct ref *ref = item->util;
1340 struct ref *dst_ref;
1341 struct commit *commit;
1342
1343 if (is_null_oid(&ref->new_oid))
1344 continue;
1345 commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1346 if (!commit)
1347 /* not pushing a commit, which is not an error */
1348 continue;
1349
1350 /*
1351 * Is this tag, which they do not have, reachable from
1352 * any of the commits we are sending?
1353 */
1354 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1355 continue;
1356
1357 /* Add it in */
1358 dst_ref = make_linked_ref(ref->name, dst_tail);
1359 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1360 dst_ref->peer_ref = copy_ref(ref);
1361 }
1362 }
1363 string_list_clear(&src_tag, 0);
1364 free(sent_tips.tip);
1365}
1366
1367struct ref *find_ref_by_name(const struct ref *list, const char *name)
1368{
1369 for ( ; list; list = list->next)
1370 if (!strcmp(list->name, name))
1371 return (struct ref *)list;
1372 return NULL;
1373}
1374
1375static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1376{
1377 for ( ; ref; ref = ref->next)
1378 string_list_append_nodup(ref_index, ref->name)->util = ref;
1379
1380 string_list_sort(ref_index);
1381}
1382
1383/*
1384 * Given only the set of local refs, sanity-check the set of push
1385 * refspecs. We can't catch all errors that match_push_refs would,
1386 * but we can catch some errors early before even talking to the
1387 * remote side.
1388 */
1389int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1390{
1391 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1392 int ret = 0;
1393 int i;
1394
1395 for (i = 0; i < nr_refspec; i++) {
1396 struct refspec *rs = refspec + i;
1397
1398 if (rs->pattern || rs->matching)
1399 continue;
1400
1401 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1402 }
1403
1404 free_refspec(nr_refspec, refspec);
1405 return ret;
1406}
1407
1408/*
1409 * Given the set of refs the local repository has, the set of refs the
1410 * remote repository has, and the refspec used for push, determine
1411 * what remote refs we will update and with what value by setting
1412 * peer_ref (which object is being pushed) and force (if the push is
1413 * forced) in elements of "dst". The function may add new elements to
1414 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1415 */
1416int match_push_refs(struct ref *src, struct ref **dst,
1417 int nr_refspec, const char **refspec, int flags)
1418{
1419 struct refspec *rs;
1420 int send_all = flags & MATCH_REFS_ALL;
1421 int send_mirror = flags & MATCH_REFS_MIRROR;
1422 int send_prune = flags & MATCH_REFS_PRUNE;
1423 int errs;
1424 static const char *default_refspec[] = { ":", NULL };
1425 struct ref *ref, **dst_tail = tail_ref(dst);
1426 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1427
1428 if (!nr_refspec) {
1429 nr_refspec = 1;
1430 refspec = default_refspec;
1431 }
1432 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1433 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1434
1435 /* pick the remainder */
1436 for (ref = src; ref; ref = ref->next) {
1437 struct string_list_item *dst_item;
1438 struct ref *dst_peer;
1439 const struct refspec *pat = NULL;
1440 char *dst_name;
1441
1442 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1443 if (!dst_name)
1444 continue;
1445
1446 if (!dst_ref_index.nr)
1447 prepare_ref_index(&dst_ref_index, *dst);
1448
1449 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1450 dst_peer = dst_item ? dst_item->util : NULL;
1451 if (dst_peer) {
1452 if (dst_peer->peer_ref)
1453 /* We're already sending something to this ref. */
1454 goto free_name;
1455 } else {
1456 if (pat->matching && !(send_all || send_mirror))
1457 /*
1458 * Remote doesn't have it, and we have no
1459 * explicit pattern, and we don't have
1460 * --all or --mirror.
1461 */
1462 goto free_name;
1463
1464 /* Create a new one and link it */
1465 dst_peer = make_linked_ref(dst_name, &dst_tail);
1466 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1467 string_list_insert(&dst_ref_index,
1468 dst_peer->name)->util = dst_peer;
1469 }
1470 dst_peer->peer_ref = copy_ref(ref);
1471 dst_peer->force = pat->force;
1472 free_name:
1473 free(dst_name);
1474 }
1475
1476 string_list_clear(&dst_ref_index, 0);
1477
1478 if (flags & MATCH_REFS_FOLLOW_TAGS)
1479 add_missing_tags(src, dst, &dst_tail);
1480
1481 if (send_prune) {
1482 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1483 /* check for missing refs on the remote */
1484 for (ref = *dst; ref; ref = ref->next) {
1485 char *src_name;
1486
1487 if (ref->peer_ref)
1488 /* We're already sending something to this ref. */
1489 continue;
1490
1491 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1492 if (src_name) {
1493 if (!src_ref_index.nr)
1494 prepare_ref_index(&src_ref_index, src);
1495 if (!string_list_has_string(&src_ref_index,
1496 src_name))
1497 ref->peer_ref = alloc_delete_ref();
1498 free(src_name);
1499 }
1500 }
1501 string_list_clear(&src_ref_index, 0);
1502 }
1503 if (errs)
1504 return -1;
1505 return 0;
1506}
1507
1508void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1509 int force_update)
1510{
1511 struct ref *ref;
1512
1513 for (ref = remote_refs; ref; ref = ref->next) {
1514 int force_ref_update = ref->force || force_update;
1515 int reject_reason = 0;
1516
1517 if (ref->peer_ref)
1518 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1519 else if (!send_mirror)
1520 continue;
1521
1522 ref->deletion = is_null_oid(&ref->new_oid);
1523 if (!ref->deletion &&
1524 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1525 ref->status = REF_STATUS_UPTODATE;
1526 continue;
1527 }
1528
1529 /*
1530 * If the remote ref has moved and is now different
1531 * from what we expect, reject any push.
1532 *
1533 * It also is an error if the user told us to check
1534 * with the remote-tracking branch to find the value
1535 * to expect, but we did not have such a tracking
1536 * branch.
1537 */
1538 if (ref->expect_old_sha1) {
1539 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1540 reject_reason = REF_STATUS_REJECT_STALE;
1541 else
1542 /* If the ref isn't stale then force the update. */
1543 force_ref_update = 1;
1544 }
1545
1546 /*
1547 * If the update isn't already rejected then check
1548 * the usual "must fast-forward" rules.
1549 *
1550 * Decide whether an individual refspec A:B can be
1551 * pushed. The push will succeed if any of the
1552 * following are true:
1553 *
1554 * (1) the remote reference B does not exist
1555 *
1556 * (2) the remote reference B is being removed (i.e.,
1557 * pushing :B where no source is specified)
1558 *
1559 * (3) the destination is not under refs/tags/, and
1560 * if the old and new value is a commit, the new
1561 * is a descendant of the old.
1562 *
1563 * (4) it is forced using the +A:B notation, or by
1564 * passing the --force argument
1565 */
1566
1567 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1568 if (starts_with(ref->name, "refs/tags/"))
1569 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1570 else if (!has_object_file(&ref->old_oid))
1571 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1572 else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1573 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1574 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1575 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1576 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1577 }
1578
1579 /*
1580 * "--force" will defeat any rejection implemented
1581 * by the rules above.
1582 */
1583 if (!force_ref_update)
1584 ref->status = reject_reason;
1585 else if (reject_reason)
1586 ref->forced_update = 1;
1587 }
1588}
1589
1590static void set_merge(struct branch *ret)
1591{
1592 struct remote *remote;
1593 char *ref;
1594 struct object_id oid;
1595 int i;
1596
1597 if (!ret)
1598 return; /* no branch */
1599 if (ret->merge)
1600 return; /* already run */
1601 if (!ret->remote_name || !ret->merge_nr) {
1602 /*
1603 * no merge config; let's make sure we don't confuse callers
1604 * with a non-zero merge_nr but a NULL merge
1605 */
1606 ret->merge_nr = 0;
1607 return;
1608 }
1609
1610 remote = remote_get(ret->remote_name);
1611
1612 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1613 for (i = 0; i < ret->merge_nr; i++) {
1614 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1615 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1616 if (!remote_find_tracking(remote, ret->merge[i]) ||
1617 strcmp(ret->remote_name, "."))
1618 continue;
1619 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1620 oid.hash, &ref) == 1)
1621 ret->merge[i]->dst = ref;
1622 else
1623 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1624 }
1625}
1626
1627struct branch *branch_get(const char *name)
1628{
1629 struct branch *ret;
1630
1631 read_config();
1632 if (!name || !*name || !strcmp(name, "HEAD"))
1633 ret = current_branch;
1634 else
1635 ret = make_branch(name, 0);
1636 set_merge(ret);
1637 return ret;
1638}
1639
1640int branch_has_merge_config(struct branch *branch)
1641{
1642 return branch && !!branch->merge;
1643}
1644
1645int branch_merge_matches(struct branch *branch,
1646 int i,
1647 const char *refname)
1648{
1649 if (!branch || i < 0 || i >= branch->merge_nr)
1650 return 0;
1651 return refname_match(branch->merge[i]->src, refname);
1652}
1653
1654__attribute__((format (printf,2,3)))
1655static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1656{
1657 if (err) {
1658 va_list ap;
1659 va_start(ap, fmt);
1660 strbuf_vaddf(err, fmt, ap);
1661 va_end(ap);
1662 }
1663 return NULL;
1664}
1665
1666const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1667{
1668 if (!branch)
1669 return error_buf(err, _("HEAD does not point to a branch"));
1670
1671 if (!branch->merge || !branch->merge[0]) {
1672 /*
1673 * no merge config; is it because the user didn't define any,
1674 * or because it is not a real branch, and get_branch
1675 * auto-vivified it?
1676 */
1677 if (!ref_exists(branch->refname))
1678 return error_buf(err, _("no such branch: '%s'"),
1679 branch->name);
1680 return error_buf(err,
1681 _("no upstream configured for branch '%s'"),
1682 branch->name);
1683 }
1684
1685 if (!branch->merge[0]->dst)
1686 return error_buf(err,
1687 _("upstream branch '%s' not stored as a remote-tracking branch"),
1688 branch->merge[0]->src);
1689
1690 return branch->merge[0]->dst;
1691}
1692
1693static const char *tracking_for_push_dest(struct remote *remote,
1694 const char *refname,
1695 struct strbuf *err)
1696{
1697 char *ret;
1698
1699 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1700 if (!ret)
1701 return error_buf(err,
1702 _("push destination '%s' on remote '%s' has no local tracking branch"),
1703 refname, remote->name);
1704 return ret;
1705}
1706
1707static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1708{
1709 struct remote *remote;
1710
1711 remote = remote_get(pushremote_for_branch(branch, NULL));
1712 if (!remote)
1713 return error_buf(err,
1714 _("branch '%s' has no remote for pushing"),
1715 branch->name);
1716
1717 if (remote->push_refspec_nr) {
1718 char *dst;
1719 const char *ret;
1720
1721 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1722 branch->refname);
1723 if (!dst)
1724 return error_buf(err,
1725 _("push refspecs for '%s' do not include '%s'"),
1726 remote->name, branch->name);
1727
1728 ret = tracking_for_push_dest(remote, dst, err);
1729 free(dst);
1730 return ret;
1731 }
1732
1733 if (remote->mirror)
1734 return tracking_for_push_dest(remote, branch->refname, err);
1735
1736 switch (push_default) {
1737 case PUSH_DEFAULT_NOTHING:
1738 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1739
1740 case PUSH_DEFAULT_MATCHING:
1741 case PUSH_DEFAULT_CURRENT:
1742 return tracking_for_push_dest(remote, branch->refname, err);
1743
1744 case PUSH_DEFAULT_UPSTREAM:
1745 return branch_get_upstream(branch, err);
1746
1747 case PUSH_DEFAULT_UNSPECIFIED:
1748 case PUSH_DEFAULT_SIMPLE:
1749 {
1750 const char *up, *cur;
1751
1752 up = branch_get_upstream(branch, err);
1753 if (!up)
1754 return NULL;
1755 cur = tracking_for_push_dest(remote, branch->refname, err);
1756 if (!cur)
1757 return NULL;
1758 if (strcmp(cur, up))
1759 return error_buf(err,
1760 _("cannot resolve 'simple' push to a single destination"));
1761 return cur;
1762 }
1763 }
1764
1765 die("BUG: unhandled push situation");
1766}
1767
1768const char *branch_get_push(struct branch *branch, struct strbuf *err)
1769{
1770 if (!branch)
1771 return error_buf(err, _("HEAD does not point to a branch"));
1772
1773 if (!branch->push_tracking_ref)
1774 branch->push_tracking_ref = branch_get_push_1(branch, err);
1775 return branch->push_tracking_ref;
1776}
1777
1778static int ignore_symref_update(const char *refname)
1779{
1780 struct object_id oid;
1781 int flag;
1782
1783 if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1784 return 0; /* non-existing refs are OK */
1785 return (flag & REF_ISSYMREF);
1786}
1787
1788/*
1789 * Create and return a list of (struct ref) consisting of copies of
1790 * each remote_ref that matches refspec. refspec must be a pattern.
1791 * Fill in the copies' peer_ref to describe the local tracking refs to
1792 * which they map. Omit any references that would map to an existing
1793 * local symbolic ref.
1794 */
1795static struct ref *get_expanded_map(const struct ref *remote_refs,
1796 const struct refspec *refspec)
1797{
1798 const struct ref *ref;
1799 struct ref *ret = NULL;
1800 struct ref **tail = &ret;
1801
1802 for (ref = remote_refs; ref; ref = ref->next) {
1803 char *expn_name = NULL;
1804
1805 if (strchr(ref->name, '^'))
1806 continue; /* a dereference item */
1807 if (match_name_with_pattern(refspec->src, ref->name,
1808 refspec->dst, &expn_name) &&
1809 !ignore_symref_update(expn_name)) {
1810 struct ref *cpy = copy_ref(ref);
1811
1812 cpy->peer_ref = alloc_ref(expn_name);
1813 if (refspec->force)
1814 cpy->peer_ref->force = 1;
1815 *tail = cpy;
1816 tail = &cpy->next;
1817 }
1818 free(expn_name);
1819 }
1820
1821 return ret;
1822}
1823
1824static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1825{
1826 const struct ref *ref;
1827 for (ref = refs; ref; ref = ref->next) {
1828 if (refname_match(name, ref->name))
1829 return ref;
1830 }
1831 return NULL;
1832}
1833
1834struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1835{
1836 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1837
1838 if (!ref)
1839 return NULL;
1840
1841 return copy_ref(ref);
1842}
1843
1844static struct ref *get_local_ref(const char *name)
1845{
1846 if (!name || name[0] == '\0')
1847 return NULL;
1848
1849 if (starts_with(name, "refs/"))
1850 return alloc_ref(name);
1851
1852 if (starts_with(name, "heads/") ||
1853 starts_with(name, "tags/") ||
1854 starts_with(name, "remotes/"))
1855 return alloc_ref_with_prefix("refs/", 5, name);
1856
1857 return alloc_ref_with_prefix("refs/heads/", 11, name);
1858}
1859
1860int get_fetch_map(const struct ref *remote_refs,
1861 const struct refspec *refspec,
1862 struct ref ***tail,
1863 int missing_ok)
1864{
1865 struct ref *ref_map, **rmp;
1866
1867 if (refspec->pattern) {
1868 ref_map = get_expanded_map(remote_refs, refspec);
1869 } else {
1870 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1871
1872 if (refspec->exact_sha1) {
1873 ref_map = alloc_ref(name);
1874 get_oid_hex(name, &ref_map->old_oid);
1875 } else {
1876 ref_map = get_remote_ref(remote_refs, name);
1877 }
1878 if (!missing_ok && !ref_map)
1879 die("Couldn't find remote ref %s", name);
1880 if (ref_map) {
1881 ref_map->peer_ref = get_local_ref(refspec->dst);
1882 if (ref_map->peer_ref && refspec->force)
1883 ref_map->peer_ref->force = 1;
1884 }
1885 }
1886
1887 for (rmp = &ref_map; *rmp; ) {
1888 if ((*rmp)->peer_ref) {
1889 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1890 check_refname_format((*rmp)->peer_ref->name, 0)) {
1891 struct ref *ignore = *rmp;
1892 error("* Ignoring funny ref '%s' locally",
1893 (*rmp)->peer_ref->name);
1894 *rmp = (*rmp)->next;
1895 free(ignore->peer_ref);
1896 free(ignore);
1897 continue;
1898 }
1899 }
1900 rmp = &((*rmp)->next);
1901 }
1902
1903 if (ref_map)
1904 tail_link_ref(ref_map, tail);
1905
1906 return 0;
1907}
1908
1909int resolve_remote_symref(struct ref *ref, struct ref *list)
1910{
1911 if (!ref->symref)
1912 return 0;
1913 for (; list; list = list->next)
1914 if (!strcmp(ref->symref, list->name)) {
1915 oidcpy(&ref->old_oid, &list->old_oid);
1916 return 0;
1917 }
1918 return 1;
1919}
1920
1921static void unmark_and_free(struct commit_list *list, unsigned int mark)
1922{
1923 while (list) {
1924 struct commit *commit = pop_commit(&list);
1925 commit->object.flags &= ~mark;
1926 }
1927}
1928
1929int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1930{
1931 struct object *o;
1932 struct commit *old, *new;
1933 struct commit_list *list, *used;
1934 int found = 0;
1935
1936 /*
1937 * Both new and old must be commit-ish and new is descendant of
1938 * old. Otherwise we require --force.
1939 */
1940 o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1941 if (!o || o->type != OBJ_COMMIT)
1942 return 0;
1943 old = (struct commit *) o;
1944
1945 o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1946 if (!o || o->type != OBJ_COMMIT)
1947 return 0;
1948 new = (struct commit *) o;
1949
1950 if (parse_commit(new) < 0)
1951 return 0;
1952
1953 used = list = NULL;
1954 commit_list_insert(new, &list);
1955 while (list) {
1956 new = pop_most_recent_commit(&list, TMP_MARK);
1957 commit_list_insert(new, &used);
1958 if (new == old) {
1959 found = 1;
1960 break;
1961 }
1962 }
1963 unmark_and_free(list, TMP_MARK);
1964 unmark_and_free(used, TMP_MARK);
1965 return found;
1966}
1967
1968/*
1969 * Compare a branch with its upstream, and save their differences (number
1970 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1971 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1972 * is not itself NULL.
1973 *
1974 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1975 * upstream defined, or ref does not exist), 0 otherwise.
1976 */
1977int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1978 const char **upstream_name)
1979{
1980 struct object_id oid;
1981 struct commit *ours, *theirs;
1982 struct rev_info revs;
1983 const char *base;
1984 struct argv_array argv = ARGV_ARRAY_INIT;
1985
1986 /* Cannot stat unless we are marked to build on top of somebody else. */
1987 base = branch_get_upstream(branch, NULL);
1988 if (upstream_name)
1989 *upstream_name = base;
1990 if (!base)
1991 return -1;
1992
1993 /* Cannot stat if what we used to build on no longer exists */
1994 if (read_ref(base, oid.hash))
1995 return -1;
1996 theirs = lookup_commit_reference(oid.hash);
1997 if (!theirs)
1998 return -1;
1999
2000 if (read_ref(branch->refname, oid.hash))
2001 return -1;
2002 ours = lookup_commit_reference(oid.hash);
2003 if (!ours)
2004 return -1;
2005
2006 /* are we the same? */
2007 if (theirs == ours) {
2008 *num_theirs = *num_ours = 0;
2009 return 0;
2010 }
2011
2012 /* Run "rev-list --left-right ours...theirs" internally... */
2013 argv_array_push(&argv, ""); /* ignored */
2014 argv_array_push(&argv, "--left-right");
2015 argv_array_pushf(&argv, "%s...%s",
2016 oid_to_hex(&ours->object.oid),
2017 oid_to_hex(&theirs->object.oid));
2018 argv_array_push(&argv, "--");
2019
2020 init_revisions(&revs, NULL);
2021 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2022 if (prepare_revision_walk(&revs))
2023 die("revision walk setup failed");
2024
2025 /* ... and count the commits on each side. */
2026 *num_ours = 0;
2027 *num_theirs = 0;
2028 while (1) {
2029 struct commit *c = get_revision(&revs);
2030 if (!c)
2031 break;
2032 if (c->object.flags & SYMMETRIC_LEFT)
2033 (*num_ours)++;
2034 else
2035 (*num_theirs)++;
2036 }
2037
2038 /* clear object flags smudged by the above traversal */
2039 clear_commit_marks(ours, ALL_REV_FLAGS);
2040 clear_commit_marks(theirs, ALL_REV_FLAGS);
2041
2042 argv_array_clear(&argv);
2043 return 0;
2044}
2045
2046/*
2047 * Return true when there is anything to report, otherwise false.
2048 */
2049int format_tracking_info(struct branch *branch, struct strbuf *sb)
2050{
2051 int ours, theirs;
2052 const char *full_base;
2053 char *base;
2054 int upstream_is_gone = 0;
2055
2056 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2057 if (!full_base)
2058 return 0;
2059 upstream_is_gone = 1;
2060 }
2061
2062 base = shorten_unambiguous_ref(full_base, 0);
2063 if (upstream_is_gone) {
2064 strbuf_addf(sb,
2065 _("Your branch is based on '%s', but the upstream is gone.\n"),
2066 base);
2067 if (advice_status_hints)
2068 strbuf_addstr(sb,
2069 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2070 } else if (!ours && !theirs) {
2071 strbuf_addf(sb,
2072 _("Your branch is up-to-date with '%s'.\n"),
2073 base);
2074 } else if (!theirs) {
2075 strbuf_addf(sb,
2076 Q_("Your branch is ahead of '%s' by %d commit.\n",
2077 "Your branch is ahead of '%s' by %d commits.\n",
2078 ours),
2079 base, ours);
2080 if (advice_status_hints)
2081 strbuf_addstr(sb,
2082 _(" (use \"git push\" to publish your local commits)\n"));
2083 } else if (!ours) {
2084 strbuf_addf(sb,
2085 Q_("Your branch is behind '%s' by %d commit, "
2086 "and can be fast-forwarded.\n",
2087 "Your branch is behind '%s' by %d commits, "
2088 "and can be fast-forwarded.\n",
2089 theirs),
2090 base, theirs);
2091 if (advice_status_hints)
2092 strbuf_addstr(sb,
2093 _(" (use \"git pull\" to update your local branch)\n"));
2094 } else {
2095 strbuf_addf(sb,
2096 Q_("Your branch and '%s' have diverged,\n"
2097 "and have %d and %d different commit each, "
2098 "respectively.\n",
2099 "Your branch and '%s' have diverged,\n"
2100 "and have %d and %d different commits each, "
2101 "respectively.\n",
2102 ours + theirs),
2103 base, ours, theirs);
2104 if (advice_status_hints)
2105 strbuf_addstr(sb,
2106 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2107 }
2108 free(base);
2109 return 1;
2110}
2111
2112static int one_local_ref(const char *refname, const struct object_id *oid,
2113 int flag, void *cb_data)
2114{
2115 struct ref ***local_tail = cb_data;
2116 struct ref *ref;
2117
2118 /* we already know it starts with refs/ to get here */
2119 if (check_refname_format(refname + 5, 0))
2120 return 0;
2121
2122 ref = alloc_ref(refname);
2123 oidcpy(&ref->new_oid, oid);
2124 **local_tail = ref;
2125 *local_tail = &ref->next;
2126 return 0;
2127}
2128
2129struct ref *get_local_heads(void)
2130{
2131 struct ref *local_refs = NULL, **local_tail = &local_refs;
2132
2133 for_each_ref(one_local_ref, &local_tail);
2134 return local_refs;
2135}
2136
2137struct ref *guess_remote_head(const struct ref *head,
2138 const struct ref *refs,
2139 int all)
2140{
2141 const struct ref *r;
2142 struct ref *list = NULL;
2143 struct ref **tail = &list;
2144
2145 if (!head)
2146 return NULL;
2147
2148 /*
2149 * Some transports support directly peeking at
2150 * where HEAD points; if that is the case, then
2151 * we don't have to guess.
2152 */
2153 if (head->symref)
2154 return copy_ref(find_ref_by_name(refs, head->symref));
2155
2156 /* If refs/heads/master could be right, it is. */
2157 if (!all) {
2158 r = find_ref_by_name(refs, "refs/heads/master");
2159 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2160 return copy_ref(r);
2161 }
2162
2163 /* Look for another ref that points there */
2164 for (r = refs; r; r = r->next) {
2165 if (r != head &&
2166 starts_with(r->name, "refs/heads/") &&
2167 !oidcmp(&r->old_oid, &head->old_oid)) {
2168 *tail = copy_ref(r);
2169 tail = &((*tail)->next);
2170 if (!all)
2171 break;
2172 }
2173 }
2174
2175 return list;
2176}
2177
2178struct stale_heads_info {
2179 struct string_list *ref_names;
2180 struct ref **stale_refs_tail;
2181 struct refspec *refs;
2182 int ref_count;
2183};
2184
2185static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2186 int flags, void *cb_data)
2187{
2188 struct stale_heads_info *info = cb_data;
2189 struct string_list matches = STRING_LIST_INIT_DUP;
2190 struct refspec query;
2191 int i, stale = 1;
2192 memset(&query, 0, sizeof(struct refspec));
2193 query.dst = (char *)refname;
2194
2195 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2196 if (matches.nr == 0)
2197 goto clean_exit; /* No matches */
2198
2199 /*
2200 * If we did find a suitable refspec and it's not a symref and
2201 * it's not in the list of refs that currently exist in that
2202 * remote, we consider it to be stale. In order to deal with
2203 * overlapping refspecs, we need to go over all of the
2204 * matching refs.
2205 */
2206 if (flags & REF_ISSYMREF)
2207 goto clean_exit;
2208
2209 for (i = 0; stale && i < matches.nr; i++)
2210 if (string_list_has_string(info->ref_names, matches.items[i].string))
2211 stale = 0;
2212
2213 if (stale) {
2214 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2215 oidcpy(&ref->new_oid, oid);
2216 }
2217
2218clean_exit:
2219 string_list_clear(&matches, 0);
2220 return 0;
2221}
2222
2223struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2224{
2225 struct ref *ref, *stale_refs = NULL;
2226 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2227 struct stale_heads_info info;
2228
2229 info.ref_names = &ref_names;
2230 info.stale_refs_tail = &stale_refs;
2231 info.refs = refs;
2232 info.ref_count = ref_count;
2233 for (ref = fetch_map; ref; ref = ref->next)
2234 string_list_append(&ref_names, ref->name);
2235 string_list_sort(&ref_names);
2236 for_each_ref(get_stale_heads_cb, &info);
2237 string_list_clear(&ref_names, 0);
2238 return stale_refs;
2239}
2240
2241/*
2242 * Compare-and-swap
2243 */
2244static void clear_cas_option(struct push_cas_option *cas)
2245{
2246 int i;
2247
2248 for (i = 0; i < cas->nr; i++)
2249 free(cas->entry[i].refname);
2250 free(cas->entry);
2251 memset(cas, 0, sizeof(*cas));
2252}
2253
2254static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2255 const char *refname,
2256 size_t refnamelen)
2257{
2258 struct push_cas *entry;
2259 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2260 entry = &cas->entry[cas->nr++];
2261 memset(entry, 0, sizeof(*entry));
2262 entry->refname = xmemdupz(refname, refnamelen);
2263 return entry;
2264}
2265
2266static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2267{
2268 const char *colon;
2269 struct push_cas *entry;
2270
2271 if (unset) {
2272 /* "--no-<option>" */
2273 clear_cas_option(cas);
2274 return 0;
2275 }
2276
2277 if (!arg) {
2278 /* just "--<option>" */
2279 cas->use_tracking_for_rest = 1;
2280 return 0;
2281 }
2282
2283 /* "--<option>=refname" or "--<option>=refname:value" */
2284 colon = strchrnul(arg, ':');
2285 entry = add_cas_entry(cas, arg, colon - arg);
2286 if (!*colon)
2287 entry->use_tracking = 1;
2288 else if (!colon[1])
2289 hashclr(entry->expect);
2290 else if (get_sha1(colon + 1, entry->expect))
2291 return error("cannot parse expected object name '%s'", colon + 1);
2292 return 0;
2293}
2294
2295int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2296{
2297 return parse_push_cas_option(opt->value, arg, unset);
2298}
2299
2300int is_empty_cas(const struct push_cas_option *cas)
2301{
2302 return !cas->use_tracking_for_rest && !cas->nr;
2303}
2304
2305/*
2306 * Look at remote.fetch refspec and see if we have a remote
2307 * tracking branch for the refname there. Fill its current
2308 * value in sha1[].
2309 * If we cannot do so, return negative to signal an error.
2310 */
2311static int remote_tracking(struct remote *remote, const char *refname,
2312 struct object_id *oid)
2313{
2314 char *dst;
2315
2316 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2317 if (!dst)
2318 return -1; /* no tracking ref for refname at remote */
2319 if (read_ref(dst, oid->hash))
2320 return -1; /* we know what the tracking ref is but we cannot read it */
2321 return 0;
2322}
2323
2324static void apply_cas(struct push_cas_option *cas,
2325 struct remote *remote,
2326 struct ref *ref)
2327{
2328 int i;
2329
2330 /* Find an explicit --<option>=<name>[:<value>] entry */
2331 for (i = 0; i < cas->nr; i++) {
2332 struct push_cas *entry = &cas->entry[i];
2333 if (!refname_match(entry->refname, ref->name))
2334 continue;
2335 ref->expect_old_sha1 = 1;
2336 if (!entry->use_tracking)
2337 hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2338 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2339 oidclr(&ref->old_oid_expect);
2340 return;
2341 }
2342
2343 /* Are we using "--<option>" to cover all? */
2344 if (!cas->use_tracking_for_rest)
2345 return;
2346
2347 ref->expect_old_sha1 = 1;
2348 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2349 oidclr(&ref->old_oid_expect);
2350}
2351
2352void apply_push_cas(struct push_cas_option *cas,
2353 struct remote *remote,
2354 struct ref *remote_refs)
2355{
2356 struct ref *ref;
2357 for (ref = remote_refs; ref; ref = ref->next)
2358 apply_cas(cas, remote, ref);
2359}